CN1494803A - Encryption of compressed video stream - Google Patents

Encryption of compressed video stream Download PDF

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Publication number
CN1494803A
CN1494803A CNA02805556XA CN02805556A CN1494803A CN 1494803 A CN1494803 A CN 1494803A CN A02805556X A CNA02805556X A CN A02805556XA CN 02805556 A CN02805556 A CN 02805556A CN 1494803 A CN1494803 A CN 1494803A
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CN
China
Prior art keywords
encryption
data piece
frame
algorithm
independent data
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Granted
Application number
CNA02805556XA
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Chinese (zh)
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CN1220384C (en
Inventor
����ˡ��Dz���
埃里克·乔伯特
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Nagravision SARL
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Nagravision SA
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Publication of CN1494803A publication Critical patent/CN1494803A/en
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Publication of CN1220384C publication Critical patent/CN1220384C/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Abstract

The purpose of the invention is to enable receipt of a compressed data stream through the use of powerful algorithms on terminals having weak cryptographic capabilities. The invention makes use of a method for encrypting a compressed video stream comprising independent data blocks and differential data blocks which consists in encrypting the independent data blocks and the differential data blocks according to a different level of encryption.

Description

The encryption of compressing video frequency flow
Technical field
The present invention relates to a method, this method is used to encrypt a compressing video frequency flow, in decrypting process, can't lose resource when improving level of security especially.
Background technology
Video compression algorithm is based on such fact, that is: usually between the piece image and the ensuing width of cloth difference less and to show the needed amount of information of these differences be to reduce compared with needed the containing much information of performance entire image.Observe and find, to another width of cloth image, a large amount of information does not change even is rediscovered in a different slightly zone from piece image.
This principle is applied in the form of MPEG-2, MPEG-3 or Quick Time type.
According to these algorithms, first width of cloth image---is called with reference to figure---by complete transmission, and the analysis to the subsequent figures picture is implemented so that determine and transmission difference therebetween then.According to mpeg standard, we distinguish the frame (I frame) of complete transmission, the variance data of MV (motion vector) type and the variance data of DFD (difference between motion vector model and true picture) type.
According to known solution, these data are encrypted according to the algorithm that and the level of security wanted adapt subsequently.
In order to keep compatible in transmission and processing procedure, each group is all encrypted separately, and in other words, the attribute of each frame still as seen, and is only meaningful encrypted.
Along with the development of storage device, enciphered data---such as a film---to be sent to subscriber unit be very common thing.
In case file is stored in subscriber unit, the third party can spend the required time to try to decipher these data to the greatest extent.
For fear of this risk, the first step is to improve the level of security of file, in other words, uses the strong algorithm that has long password.
Although this method is gratifying on level of security, it also shows the inconvenience that need drop into valuable source on decrypting device.
The developing direction of various viewing device is to use data by the unit with low code capacity.This is exactly the example that has the new mobile phone of display screen for instance.To this type of unit, use complicated algorithm in real time and the performance that do not reduce this unit is impossible.
Therefore, use is not suitable for being used to all types of subscriber units by strong algorithm ciphered data piece.
Summary of the invention
Thereby this application aims is to make the more weak terminal of decoding capability can use powerful algorithm.
This purpose is that the encryption method by a compressing video frequency flow realizes that this compressing video frequency flow comprises independent data piece and variance data piece, and described method is encrypted independent data piece and variance data piece according to different encryption levels.
To the independent data piece, we be interpreted as can be not with reference to the information of front and therefrom obtain the information of decompress(ion) signal.Can be complete frame (I frame) for instance.
To the variance data piece, we are interpreted as the information that can obtain the decompress(ion) signal by the signal of using different information correction front wherein.
In fact, this solution can focus on the highest safeguard protection on the requisite information of image decompression.According to this method, first algorithm is applied to the whole frame (I frame) of compressed video signal, and second algorithm is applied to the different information of motion vector type or DFD type.
This difference also can be by using the password of different length to realize according to data type.Like this, whole frame will be encrypted with the password of one 2048 binary digit, and different information then can be encrypted with the password of one 128 binary digit.
According to an embodiment of the invention, different information is not encrypted.
It should be noted, also can use this method based on other information source of difference principle work.This example is exactly the example according to the MP3 format compressed music.
Description of drawings
The present invention is better understood under the help of nonrestrictive accompanying drawing below, wherein:
Fig. 1 has described the compressive flow before the cryptographic operation,
Fig. 2 has represented the compressive flow of encrypted form,
Fig. 3 has represented the compressive flow in the transmission.
Embodiment
In Fig. 1, compressive flow is represented with a series of whole frame (I) and different information (P/B).According to this example, first whole frame I1 back and then is used for rebuilding the frame P/B1-2 from whole frame I1 to the successive frame the whole frame I2.
Similarly, whole frame I2 back and then is used for arriving the continuous difference frame P/B2-3 of whole frame I3.
Then, this data flow according to the type of the frame described in Fig. 2 by the encryption of selectivity.In this drawing, we are that the first password k1 of 2048 binary digits encrypts whole frame I1, I2 and I3 with length.The second password k2---such as long 128 binary digits---is used to encrypt difference frame P/B1-2 and P/B2-3.
The length of password k1 given here and k2 is example as an illustration, and it can be other any length.
According to the present invention, the difference of encrypting quality can realize in the password rank or on employed algorithm rank.So for instance, represented an IDEA (International Data Encryption Algorithm according to the encryption of k1, IDEA) class algorithm has been represented a DES (Data EncryptionStandard, data encryption standard) class algorithm according to the encryption of k2.
In the transmission course of this data flow, whole frame such as Fig. 3 description are at first transmitted.
This characteristic allows receiving element get started being decrypted than the frame of long process time.In case these frames are decrypted, owing to can carry out fast, the processing of difference frame be can be done in real time for the selected algorithm types of difference frame.
According to an embodiment of the invention, to the encryption level of whole frame be first frame according to it---such as frame I1---or the frame of back (I2 and I3) and difference.In fact, for the signal that decompresses from deciphering benefits, we must handle first frame at once, are difference frame then.Here it is why first frame of a frame sequence use one than the whole frame of back decipherment algorithm faster.
This algorithm can be the same with the algorithm that is used for difference frame, also can be another algorithm.

Claims (4)

1. the method for a ciphered compressed video flowing, described compressing video frequency flow comprises independent data piece (I) and variance data piece (P/B), it is characterized in that described method encrypts independent data piece (I) and variance data piece (P/B) according to different encryption levels.
2. method according to claim 1 ciphered compressed video flowing is characterized in that independent data piece (I) with a high-level algorithm for encryption, and variance data piece (P/B) is with a fast decryption algorithm for encryption.
3. method according to claim 1 is characterized in that independent data piece (I) with one or several long password encryption, and variance data stream (P/B) is with one or several short password encryption.
4. one according to the method one of in the claim 1 to 3, it is characterized in that, in the transmission course of compressed signal, independent data piece (I) is by composition sequence, and the encryption level that this method is to encrypt this sequence first data block is different from the encryption level of the subsequent data blocks in the sequence.
CNB02805556XA 2001-02-26 2002-02-25 Encryption of compressed video stream Expired - Fee Related CN1220384C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3442001 2001-02-26
CH20010344/2001 2001-02-26

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CN1494803A true CN1494803A (en) 2004-05-05
CN1220384C CN1220384C (en) 2005-09-21

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US (1) US7212636B2 (en)
EP (1) EP1374588B1 (en)
KR (1) KR100850825B1 (en)
CN (1) CN1220384C (en)
AT (1) ATE303699T1 (en)
BR (1) BRPI0207581B1 (en)
CA (1) CA2438599C (en)
DE (1) DE60205879T2 (en)
ES (1) ES2248516T3 (en)
WO (1) WO2002069638A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100505866C (en) * 2004-10-28 2009-06-24 武汉大学 A video information encrypting-decrypting method
CN1758587B (en) * 2005-09-06 2011-10-26 宏碁股份有限公司 Data processing method
CN101286837B (en) * 2008-05-13 2012-08-29 江苏大学 Message encryption device and method oriented to storage area network
CN104734723A (en) * 2015-03-10 2015-06-24 中国人民解放军信息工程大学 Data conversion method based on compression and scrambling
CN106209896A (en) * 2016-07-29 2016-12-07 网宿科技股份有限公司 Streaming media encryption method based on audio frequency and video form and module
CN111757062A (en) * 2020-06-29 2020-10-09 郑州信大捷安信息技术股份有限公司 Efficient and safe transmission method and system for video stream

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US7224310B2 (en) 2002-11-20 2007-05-29 Nagravision S.A. Method and device for the recognition of the origin of encrypted data broadcasting
WO2004056112A1 (en) * 2002-12-16 2004-07-01 Koninklijke Philips Electronics N.V. Method and apparatus to encrypt video data streams
FR2849307B1 (en) * 2002-12-24 2006-10-27 Viaccess Sa METHOD AND SYSTEM FOR SECURING ENLARGED DATA
US20040193871A1 (en) * 2003-03-28 2004-09-30 Broadcom Corporation System and method for transmitting data using selective partial encryption
US20060269055A1 (en) * 2005-05-26 2006-11-30 International Business Machines Corporation Method and apparatus for improving performance and security of DES-CBC encryption algorithm
KR20090002939A (en) * 2007-07-05 2009-01-09 삼성전자주식회사 A method of transmitting and receiving video data in a digital broadcasting service and an apparatus thereof
ES2556271T3 (en) 2008-08-22 2016-01-14 Qualcomm Incorporated Procedure and apparatus for transmitting and receiving protected data and unprotected data
US8472625B2 (en) * 2009-09-16 2013-06-25 Broadcom Corporation Method and system for protecting 3D video content
US9066117B2 (en) * 2012-02-08 2015-06-23 Vixs Systems, Inc Container agnostic encryption device and methods for use therewith
US8744078B2 (en) * 2012-06-05 2014-06-03 Secure Channels Sa System and method for securing multiple data segments having different lengths using pattern keys having multiple different strengths
KR102426067B1 (en) 2014-08-07 2022-07-28 디빅스, 엘엘씨 Systems and methods for protecting elementary bitstreams incorporating independently encoded tiles

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100505866C (en) * 2004-10-28 2009-06-24 武汉大学 A video information encrypting-decrypting method
CN1758587B (en) * 2005-09-06 2011-10-26 宏碁股份有限公司 Data processing method
CN101286837B (en) * 2008-05-13 2012-08-29 江苏大学 Message encryption device and method oriented to storage area network
CN104734723A (en) * 2015-03-10 2015-06-24 中国人民解放军信息工程大学 Data conversion method based on compression and scrambling
CN106209896A (en) * 2016-07-29 2016-12-07 网宿科技股份有限公司 Streaming media encryption method based on audio frequency and video form and module
CN106209896B (en) * 2016-07-29 2020-02-18 网宿科技股份有限公司 Streaming media encryption method and module based on audio and video formats
CN111757062A (en) * 2020-06-29 2020-10-09 郑州信大捷安信息技术股份有限公司 Efficient and safe transmission method and system for video stream

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KR100850825B1 (en) 2008-08-06
US7212636B2 (en) 2007-05-01
KR20040011464A (en) 2004-02-05
BRPI0207581B1 (en) 2016-05-24
CA2438599C (en) 2011-09-20
EP1374588A1 (en) 2004-01-02
US20030133571A1 (en) 2003-07-17
ES2248516T3 (en) 2006-03-16
DE60205879T2 (en) 2006-06-08
DE60205879D1 (en) 2005-10-06
WO2002069638A1 (en) 2002-09-06
CN1220384C (en) 2005-09-21
EP1374588B1 (en) 2005-08-31
ATE303699T1 (en) 2005-09-15
CA2438599A1 (en) 2002-09-06
BR0207581A (en) 2004-04-27

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Termination date: 20190225